I do the PH test for the fish. The PH is the amount of acid in the tank, the usual PH is 7.0-7.2. If the PH is above 7.2 or lower than 7.0 the fish will slowly start dying. To maintain the usual PH you should clean out the tank daily and every once a while change the water.
Today's PH is 7.2. :)
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